They can be used separately; both can be chained together to create one large drive, or one can be used to back up the other.

它们可以单独使用，既可以链接在一起创建一个大的驱动器，或一个可以用来备份的。

youdao

This geological engineering gadding car uses dual power drive, the power of the vehicle and the power for the special device of the drill work separately.

本地质工程钻机车采用双动力驱动，汽车动力与钻机专用装置动力分离工作。

youdao

Max's mother had to say good-bye to her sick son and drive separately.

CNN: Flu leads to Texas teen's death

In most cases, it is better to have higher rather than lower engagement scores, but in order to take action directed towards improving organizational performance, the items need to be looked at separately and used to make data-based changes that will drive employee retention, performance, and commitment.

FORBES: An Idiot's Guide to Employee Engagement

This, they worry, could drive out smaller players and force energy producers to have separately capitalised subsidiaries, and might strangle the market in its infancy.

ECONOMIST: Is there life after Enron in Europe's power markets?